Imidazole → 2-(1-((tert-Butyldimethylsilyl)oxy)-2-methylpropan-2-yl)-6-fluoro-5-nitro-1H-indole

HRID 468522Notes

Reaction equation

HRID 468522 reaction equation
[F:1][C:2]1[CH:10]=[C:9]2[C:5]([CH:6]=[C:7]([C:11]([CH3:15])([CH3:14])[CH2:12][OH:13])[NH:8]2)=[CH:4][C:3]=1[N+:16]([O-:18])=[O:17].[CH3:19][C:20]([Si:23](Cl)([CH3:25])[CH3:24])([CH3:22])[CH3:21].N1C=CN=C1>C(Cl)Cl>[Si:23]([O:13][CH2:12][C:11]([C:7]1[NH:8][C:9]2[C:5]([CH:6]=1)=[CH:4][C:3]([N+:16]([O-:18])=[O:17])=[C:2]([F:1])[CH:10]=2)([CH3:15])[CH3:14])([C:20]([CH3:22])([CH3:21])[CH3:19])([CH3:25])[CH3:24]

Participants

5

Reactant 3

HCID 795ImidazoleHCID 28928tert-Butyldimethylsilyl chlorideHCID 591293832-(6-fluoro-5-nitro-1H-indol-2-yl)-2-methylpropan-1-ol

Product 1

HCID 591292962-(1-((tert-Butyldimethylsilyl)oxy)-2-methylpropan-2-yl)-6-fluoro-5-nitro-1H-indoleYield 38%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a stirred solution of 2-(6-fluoro-5-nitro-1H-indol-2-yl)-2-methylpropan-1-ol (10.0 g) in CH2Cl2 was added TBSCl (8.9 g), imidazole (8.1 g, 0.12 mol) at room temperature. The mixture was stirred overnight. The solvent was evaporated in vacuo and the residue was purified by chromatography on silica gel (10% EtOAc in petroleum ether) to give 2-(1-(tert-butyldimethylsilyloxy)-2-methylpropan-2-yl)-6-fluoro-5-nitro-1H-indole (5.3 g, 38%). 1H NMR (300 MHz, CDCl3) 9.51 (s, 1H), 8.31 (d, J=7.5 Hz, 1H), 7.02 (d, J=11.7 Hz, 1H), 6.32 (s, 1H), 3.63 (s, 2H), 1.35 (s, 6H), 0.99 (s, 9H), 0.11 (s, 6H).

Workup

  1. customThe solvent was evaporated in vacuo
  2. customthe residue was purified by chromatography on silica gel (10% EtOAc in petroleum ether)

Sources & evidence

ORD record
ord-9a0b1d57a94a4676926ef80a8a489537
Source dataset
uspto-grants-2014_01
Patent number
US08623905B2

Reaction notes

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